Antenna structure



FIG. 1 is a perspective view of an antenna structure showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is an inverted rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is front elevational view thereof. 

The ornamental design for an antenna structure, as shown and described. 